math2visual_system/nginx.conf at main · ETH-PEACH-Lab/math2visual_system · GitHub

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# Resolver for SSL stapling OCSP
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 5s;

# HTTP server - redirect to HTTPS and handle ACME challenge
server {
    listen 80;
    server_name _;

    # Hide nginx version
    server_tokens off;

    # Let's Encrypt ACME challenge
    location /.well-known/acme-challenge/ {
        root /var/www/certbot;
    }

    # Redirect all other HTTP traffic to HTTPS
    location / {
        return 301 https://$host$request_uri;
    }
}

# HTTPS server
server {
    listen 443 ssl;
    http2 on;
    server_name _;

    # Hide nginx version
    server_tokens off;

    root /usr/share/nginx/html;
    index index.html;

    # SSL Configuration
    ssl_certificate /etc/letsencrypt/live/localhost/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/localhost/privkey.pem;

    # SSL Security Settings
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers 'ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384';
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;
    ssl_session_tickets off;
    ssl_stapling on;
    ssl_stapling_verify on;
    ssl_buffer_size 8k;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_min_length 1000;
    # Note: text/html is included by default in nginx, so we don't need to specify it explicitly
    gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml+rss application/rss+xml image/svg+xml;

    # Security headers
    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Don't cache HTML files (always get latest to pick up new asset references)
    location ~* \.html$ {
        expires -1;
        add_header Cache-Control "no-cache, no-store, must-revalidate";
        add_header Pragma "no-cache";
    }

    # Serve static files
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Proxy API requests to Flask backend
    # Use ^~ so regex locations (e.g., static asset caching) do not override /api routes.
    location ^~ /api {
        proxy_pass http://127.0.0.1:5000;
        proxy_http_version 1.1;

        # Connection settings
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_cache_bypass $http_upgrade;

        # Headers
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Host $host;

        # Buffer settings - disabled for streaming support (requires async workers)
        proxy_buffering off;
        # proxy_buffer_size 4k;  # Not needed when proxy_buffering is off
        # proxy_buffers 8 4k;   # Not needed when proxy_buffering is off
        # proxy_busy_buffers_size 8k;  # Not needed when proxy_buffering is off

        # Timeout settings for ML processing
        proxy_connect_timeout 60s;
        proxy_send_timeout 120s;
        proxy_read_timeout 120s;

        # Request size limit (matches backend limit - allows SVG uploads up to 12MB)
        client_max_body_size 12M;
    }

    # Cache static assets (only file types used by the application)
    # Vite generates content-hashed filenames, so these can be cached aggressively.
    # Note: Placed after the /api block; ^~ on /api prevents these from intercepting API requests
    # Only cache types we actually ship (see frontend/dist and frontend/public)
    location ~* \.(js|css|png|ico|svg|json)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        access_log off;
    }
}